Vim Airline moved its themes, including the light theme used in the basic configuration of dotvim to another repository.
By requiring the new repo (which is NeoBundle and Plugin compatible) people can use the basic themes for vim airline again.

the git url (git://) is not secure and the port is often blocked in large enterprises (I'm not even sure github supports it anymore). The https and ssh urls are safer and not usually blocked (ssh is sometimes). The https url has the advantage/disadvantage of honoring any https proxies.